Thermodynamics of proton dissociations from aqueous l-valine and l-2-amino-n-butanoic acid: apparent molar volumes and apparent molar heat capacities of the protonated cationic, neutral zwitterionic, and deprotonated anionic species at temperatures from 278.15⩽T/K⩽393.15, at molalities 0.015⩽m/mol·kg−1⩽0.67, and pressure p=0.35 MPa

Thermodynamics of complexation of aqueous 18-crown-6 with barium ion: apparent molar volumes and apparent molar heat capacities of aqueous (18-crown-6+barium nitrate) at temperatures (278.15 to 393.15) K, at molalities (0.02 to 0.33) mol·kg−1, and at the pressure 0.35 MPa

“…The iterative procedure used to determine the ''best fit'' values of the regression parameters c i and v i for equations (1) and (2) for ð18C6-Ba 2þ ; 2NO À 3 ÞðaqÞ was similar to procedures described previously [17,19,20]. The procedure requires values of lg Q and D r H m as integration constants at some reference temperature, in this case, T* = 298.15.…”

Thermodynamics of complexation of aqueous 18-crown-6 with potassium ion: apparent molar volumes and apparent molar heat capacities of aqueous 18-crown-6 and of the (18-crown-6+potassium chloride) complex at temperatures (278.15 to 393.15) K, at molalities (0.02 to 0.3) mol·kg−1, and at the pressure 0.35 MPa

“…The heat capacity relaxation term C p,rel has been described previously [35], and for our isobaric density experiments V rel " 0. We used YoungÕs Rule first to determine C p,/ (18C6: K + ,Cl À ) and m eq for each species at all T and m t ( figure 3).…”

“…The iterative procedure used to determine the ''best fit'' values of the parameters c i and v i for equations (1) and (2) for the complex (18C6: K + ,Cl À )(aq) was similar to procedures described previously [23,35,36]. The procedure requires values of log Q and D r H m as integration constants at some reference temperature, in this case, T* = 298.15.…”

“…In this paper, we report the apparent molar volumes V / at temperatures T = (278.15 to 363.15) K and the apparent molar heat capacities C p,/ at T = (278.15 to 393.15) K for 18C6(aq) and for (18C6 + KCl)(aq) at molalities m = (0.02 to 0.3) mol AE kg À1 and at the pressure 0. 35 MPa. Because the extent of complexation of 18C6 with K + is dependent on temperature, it was necessary to apply YoungÕs Rule in an iterative calculation procedure to resolve V / and C p,/ for the complex (18C6: K + ,Cl À )(aq).…”

Thermodynamics of proton dissociations from aqueous threonine and isoleucine at temperatures from (278.15 to 393.15)K, molalities from (0.01 to 1.0)mol·kg−1, and at the pressure 0.35MPa: Apparent molar heat capacities and apparent molar volumes of zwitterionic, protonated cationic, and deprotonated anionic forms

“…We recently reported our results for the apparent molar volumes V / and apparent molar heat capacities C p,/ of aqueous proline [1], valine [2], L-2-aminobutanoic acid [2], serine [3], alanine [4], and others. In this paper we report our measured densities and heat capacities of aqueous solutions of threonine and isoleucine in their zwitterionic forms HThr ± (aq) and HIle ± (aq) and with the addition of equimolal HCl {HThr ± (aq) + HCl(aq)} and {HIle ± (aq) + HCl(aq)}, and equimolal NaOH {HThr ± (aq) + NaOH(aq)} and {HIle ± (aq) + NaOH(aq)}.…”